transmission oil JEEP CHEROKEE 1988 Service Repair Manual
[x] Cancel search | Manufacturer: JEEP, Model Year: 1988, Model line: CHEROKEE, Model: JEEP CHEROKEE 1988Pages: 1378, PDF Size: 19.9 MB
Page 11 of 1378
Crankshaft End Play
1) Using dial indicator, check crankshaft end play. Inspect
crankshaft thrust surfaces or thrust bearing for wear if not within
specification. See ENGINE SPECIFICATIONS table.
2) Replace thrust bearing if required. When replacing thrust
bearing, pry crankshaft forward then reward prior to tightening main
bearing cap to specification. Recheck end play. Replace crankshaft if
not within specification.
REAR MAIN BEARING OIL SEAL
Removal
Remove transmission, clutch housing and flywheel or drive
plate. Using screwdriver, pry oil seal from housing. Avoid damage to
surrounding area.
NOTE: Shim must be used when installing old type oil seal Part No.
(324 1669) only. DO NOT use shim when installing new type
oil seal Part. No. (8933 004 143).
Installation
1) Position wing nut on Seal Installer (J-36306) until it
contacts the shaft nut. See Fig. 7. Install shim if old type seal Part
No. (324 1669) is used.
2) Lubricate inner and outer edges of seal. Install seal on
seal installer with seal dust shield toward the wing nut. Install seal
installer on crankshaft so pilot and dowel are positioned on the
crankshaft.
3) Thread the seal installer attaching screws into the
crankshaft and tighten. Rotate wing nut until it bottoms. This will
properly position the seal.
4) Remove seal installer. Ensure dust shield is not curled
under. Reverse removal procedures for remaining components.
Fig. 7: Installing Rear Main Bearing Oil Seal
WATER PUMP
Removal
Page 75 of 1378
ECU signal line and the other end connected to ground. As throttle
valve angle changes, a return voltage is sent back to the ECU through
the third wire. Output voltage to the ECU is about one volt when
throttle valve is at idle position, and about 5 volts when throttle
valve is at wide open throttle.
A dual TPS is used on automatic transmission equipped models.
The additional sensor provides throttle position information to the
transmission.
Knock Sensor
A knock sensor is mounted on the lower left side of block,
just above the oil pan. This sensor detects abnormal engine vibration
due to "detonation" and/or "pre-ignition". The knock sensor supplies
detonation information to the ECU. The ECU then alters ignition timing
as needed to maintain maximum timing under most operating conditions.
Park/Neutral (P/N) Switch
The P/N switch is mounted in automatic transmission equipped
vehicles. The switch indicates when the transmission is in Park or
Neutral.
Speed Sensor
The speed sensor is a nonadjustable sensor attached to the
flywheel/drive plate housing with special shoulder bolts. This sensor
provides Top Dead Center (TDC) and engine speed information to the ECU\
by counting the flywheel teeth as they pass during engine operation.
The flywheel has a large trigger tooth and notch located 12 small
teeth before each TDC position. See Fig. 2.
Fig. 2: Design of Speed Sensor
When a small tooth and notch pass the magnetic core of the
sensor, the concentration and collapse of the magnetic field created
induces a small voltage spike into the sensor pick-up coil windings.
Page 105 of 1378
of the scale, a symbol for defroster indicates defrost position. In
"BI-LEVEL" position, a mixture of floor heat and defroster air is
obtained.
The lower temperature control lever operates blend-air door
in heater core housing. At full right position, all air is directed
through heater core, providing maximum heat flow. At full left
position, all air is directed around heater core providing fresh air.
Control can be set in any intermediate position to provide a blend of
heated and unheated air. Heater must be in heat or defrost mode before
any air can enter vehicle.
TROUBLE SHOOTING
See JEEP TROUBLE SHOOTING at the end of this article.
REMOVAL & INSTALLATION
CONDENSER
Removal (Cherokee, Comanche & Wagoneer) NOTE: On these
models, condenser and receiver-drier are replaced
as a unit.
1) Drain radiator. Disconnect fan shroud and radiator hoses.
Disconnect automatic transmission cooler lines (if equipped).
Discharge A/C system using approved refrigerant recovery/recycling
equipment.
2) Disconnect A/C hoses from condenser. Unplug low pressure
switch. Remove radiator and condenser as an assembly. Detach condenser
retaining bolts. Separate condenser from radiator. Remove receiver-
drier from condenser.
NOTE: Plug receiver-drier openings whenever unit is removed from
condenser. Add 1 oz. of refrigerant oil (AMC No. 8132400) to
system when replacing condenser.
Installation
To install, reverse removal procedure. Fill radiator.
Evacuate, leak test, recharge and check A/C system operation.
Removal (Wrangler)
1) Discharge system (slowly to prevent loss of compressor
oil) using approved refrigerant recovery/recycling equipment. Drain
coolant. Remove fan shroud and radiator. Disconnect pressure line at
condenser. Remove condenser mounting screws. Tilt bottom of condenser
toward engine.
2) From underside of vehicle, disconnect hose attaching
receiver-drier to evaporator. Plug all openings to prevent entry of
dirt or moisture. Remove receiver-drier and condenser assembly. Remove
receiver-drier from condenser.
Installation
To install, reverse removal procedure. Fill radiator.
Evacuate, leak test, recharge and check A/C system operation.
RECEIVER-DRIER
NOTE: On Cherokee, Comanche and Wagoneer, receiver-drier is
removed with condenser and radiator as an assembly.
Removal (Wrangler)
Page 203 of 1378
Fig. 5: Identifying TPS Electrical Connector
Courtesy of Chrysler Corp.
VALVE BODY SOLENOID
With oil pan removed, disconnect electrical connector from
valve body solenoid. Using ohmmeter, check resistance between valve
body solenoid electrical terminal and solenoid mounting bracket.
Replace valve body solenoid if resistance is not 11-15 ohms.
TROUBLE SHOOTING CHARTS & CODE CHARTS
NOTE: Following trouble shooting charts and illustrations are
courtesy of Chrysler Corp. Always start by performing
TEST 1A - VERIFICATION OF THE COMPLAINT . When diagnosing
transmission, it may be necessary to verify TCM connector
terminals, circuits and function, See Fig. 6.
NOTE: When using trouble shooting charts, Transmission Control
Module (TCM) may be referred to as Transmission Control Unit
(TCU). Diagnostic trouble code may be referred to as fault
code. Neutral safety switch may be referred to as
Page 276 of 1378
Removal
1) Raise and support vehicle. Remove drain plug and drain
transmission fluid. Remove bolts and oil pan. Remove bolts, oil screen
and gasket.
2) Disconnect electrical connectors from valve body solenoid.
Mark electrical connector location for reassembly reference if more
than one valve body solenoid is being removed. Remove bolt, valve body
solenoid and "O" ring.
CAUTION: DO NOT allow components to fall from valve body when
removing valve body solenoid.
Installation
1) To install, reverse removal procedure using NEW "O" ring
and NEW gaskets. Tighten valve body solenoid bolt and oil screen bolt
to specification. See TORQUE SPECIFICATIONS at end of article.
2) Ensure magnet is installed in oil pan and does not
interfere with valve body oil tubes. Apply 1/8" bead of Loctite 599
sealant on oil pan mounting flange. Install oil pan. Install and
tighten bolts to specification. See TORQUE SPECIFICATIONS.
3) Install NEW gasket and drain plug. Tighten drain plug to
specification. See TORQUE SPECIFICATIONS at end of article. Fill
transmission to proper fluid level with Mopar Dexron-IIE/Mercon ATF.
TORQUE SPECIFICATIONS
TORQUE SPECIFICATIONS \
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Application Ft. Lbs. (N.m)
Drain Plug ....................................... 15 (20)
INCH Lbs. (N.m)
Neutral Safety Switch Adjusting Bolt .......... 108 (12.2)
Neutral Safety Switch Retaining Nut ............. 61 (6.9)
Oil Pan Bolt .................................... 65 (7.3)
Oil Screen Bolt ................................. 84 (9.5)
Speed Sensor Bolt ............................... 65 (7.3)
Valve Body Solenoid Bolt ........................ 84 (9.5)
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Vibration can come from many sources. Before overhauling
driveline, check other sources of possible vibration as follows:
* Tires and wheels - Check tire inflation and wheel balance.
Check for foreign objects in tread, damaged tread, mismatched
tread patterns or incorrect tire size.
* Center Bearing - Tighten drive shaft center bearing
mounting bolts. If bearing insulator is deteriorated or
oil-soaked, replace it.
* Engine & Transmission Mountings - Tighten mounting bolts.
If mountings are deteriorated, replace them.
* Drive Shaft - Check drive shaft for damage or dents that
could affect balance. Check for undercoating adhering to
shafts. If present, clean shafts thoroughly.
* Universal Joints - Check for foreign material stuck in
joints. Check for loose bolts and worn bearings.
ADJUSTMENTS
DRIVE SHAFT PHASING
One-Piece Shafts
Check that flanges on either end of drive shaft are in same
plane. Often there are arrows on slip joint and drive shaft to aid in
alignment. See Fig. 2. If flanges are not in same plane, disassemble
universal joint and align.
Fig. 2: Slip Joint Alignment Arrows
Align arrows for proper shaft phasing.
2-Piece Shafts
1) All General Motors models with 32 splines use keys on
spline and slip joint, which can only mate in correct position. On
most models with 2-piece shafts, proper phasing is accomplished by
keys on spline and slip joint.
Page 436 of 1378
FLANGES
FLEX PLATES
FLUID LEVEL INDICATORS
FLUIDS AND LUBRICANTS
FLYWHEELS
FORCE MOTORS
GUIDES
HALF SHAFTS
HOSES, LINES AND TUBES
HOUSINGS (BELL, CASE, TAIL (EXTENSION) AND AUXILIARY)
INTERMEDIATE SHAFT SUPPORT BEARINGS
KEY INTERLOCK SYSTEMS
LIMITED SLIPS
LINES
LINKAGES (EXTERNAL)
LOCKING HUB ASSEMBLIES
LOCKING HUB CONTROL KNOBS
LUBRICANTS
METAL-CLAD SEALS
METALASTIC JOINTS
MODULATOR PINS
MODULATORS
MOUNTS (ENGINE, TRANSAXLE AND TRANSMISSION)
ODOMETER DRIVES (MECHANICAL)
ODOMETER HEADS (MECHANICAL)
OIL PANS
PANS
PILOT HOLES
PRESSURE PLATES
PRESSURE SWITCHES
RACES
RUBBER JOINTS (METALASTIC)
SCREENS
SEALS
SEALS (METAL-CLAD)
SELECTOR INTERLOCK SYSTEMS
SERVOS
SHIFT INTERLOCK SYSTEMS (SELECTOR AND KEY INTERLOCK SYSTEMS)
SENSORS
SIDE COVERS
SLIP YOKES
SOLENOIDS
SPEED SENSORS (ELECTRONIC WHEEL AND VEHICLE)
SPEEDOMETER-DRIVEN GEAR HOUSINGS
SPEEDOMETER/ODOMETER DRIVES (MECHANICAL)
SPEEDOMETER/ODOMETER HEADS (MECHANICAL)
SPEEDOMETERS AND ODOMETERS (ELECTRONIC)
SWITCHES
TONE WHEELS
TOOTHED RINGS (TONE WHEELS)
TORQUE CONVERTERS
TRANSAXLE MOUNTS
TRANSDUCERS (TRANSMISSION)
TRANSMISSION COOLERS
TRANSMISSION MOUNTS
TRANSMISSION PANS
TRANSMISSION RANGE INDICATORS (PRNDL)
TUBES
UNIVERSAL JOINTS (CARDON OR CROSS TYPE)
VACUUM CONTROLS
VACUUM HOSES
VACUUM MOTORS
VACUUM-OPERATED SWITCHES
Page 448 of 1378
![JEEP CHEROKEE 1988 Service Repair Manual CLUTCH DISCS (MANUAL TRANSMISSION)
CLUTCH DISC (MANUAL TRANSMISSION) INSPECTION \
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CLUTCH DISC (MANUAL TRANSMISSION) INSPECTION \
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CLUTCH DISCS (MANUAL TRANSMISSION)
CLUTCH DISC (MANUAL TRANSMISSION) INSPECTION \
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Condition Code Procedure
Backing plate cracked ... A ............ Require replacement.
Broken .................. A ............ Require replacement.
Contaminated with oil ... A ............ Require replacement.
Damper cushion broken ... A ............ Require replacement.
Damper cushion
collapsed .............. A ............ Require replacement.
Damper spring collapsed . A ............ Require replacement.
Damper spring missing .. C ........ ( 1) Require replacement.
Friction material cracked
through ................ B ............ Require replacement.
Friction material flaking
or chunking ............ B ............ Require replacement.
Friction material surface
cracking ............... B ......... No service suggested or
required.
Grooved ................. B ......... No service suggested or
required unless the pressure
plate or flywheel is being
resurfaced or replaced. In this
case, replacement of clutch
disc is required.
Ridged .................. B ......... No service suggested or
required unless the pressure
plate or flywheel is being
resurfaced or replaced. In this
case, replacement of clutch
disc is required.
Splines worn, affecting
performance ............ A ............ Require replacement.
Warped .................. A ............ Require replacement.
Wear exceeds
specifications (where
applicable) ............ B ............ Require replacement.
Worn close to the end of
its useful life ........ 1 ............ Suggest replacement.
Worn, affecting
performance ............ A ............ Require replacement.
( 1) - Not all clutch discs have springs in all spring
chambers on the disc.
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CLUTCH FORKS
CLUTCH FORK INSPECTION \
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Condition Code Procedure
Bent .................... B ............ Require replacement.
Broken .................. A .. Require repair or replacement.
Cracked ................. B .. Require repair or replacement.
Worn close to the end of
its useful life ........ 1 ............ Suggest replacement.
Worn, affecting
performance ............ A ............ Require replacement.
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Page 462 of 1378
Condition Code Procedure
Attaching hardware
broken ................. A ... Require repair or replacement
of hardware.
Attaching hardware
missing ................ C .......... Require replacement of
hardware.
Attaching hardware not
functioning ............ A ... Require repair or replacement
of hardware.
Broken .................. A ............ Require replacement.
Leaking (hydraulic
mount) ................. A ............ Require replacement.
Mounting hole worn,
affecting performance .. A ............ Require replacement.
Mounting hole worn, not
affecting performance .. .. ........ No service suggested or
required.
Rubber deteriorated,
affecting performance .. A ............ Require replacement.
Rubber deteriorated, not
affecting performance .. .. ........ No service suggested or
required.
Threads damaged ......... A .. Require repair or replacement.
Threads stripped (threads
missing) ............... A ............ Require replacement.
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ODOMETER DRIVES (MECHANICAL)
See SPEEDOMETER/ODOMETER DRIVES (MECHANICAL) .
ODOMETER HEADS (MECHANICAL)
See SPEEDOMETER/ODOMETER HEADS (MECHANICAL) .
OIL PANS
See TRANSMISSION PANS .
PANS
See TRANSMISSION PANS .
PILOT HOLES
See DOWEL PINS, GUIDES AND PILOT HOLES .
PRESSURE PLATES
PRESSURE PLATE INSPECTION \
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Condition Code Procedure
Balance weight missing .. C ............ Require replacement.
Broken .................. A ............ Require replacement.
Contact surface
distorted .............. B ............ Require replacement.
Cracks .................. B ............ Require replacement.
Fingers bent ............ A ............ Require replacement.
Hard spots .............. B ............ Require replacement.
Page 501 of 1378
Engine Coolant In coolant overflow bottle.
Engine Oil In oil pan.
Front/Rear Axles On front/rear of differential.
Power Steering In power steering pump
reservoir.
Transfer Case In rear portion of transfer
case.
Transmission On fill plug (M/T) or dipstick\
(A/T).
Windshield Washer On bottom of windshield washer
reservoir.
Fuel Gauge Sending Unit In fuel tank.